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NASCAR tightly regulates the chassis and materials. The chassis are mild steel tubing. The sq frames are .120 wall and the other tubes vary from .065 up to .090 1 3/4 tubing depending on where the tube is located and how critical the tube is. Most of the main safety tube is 1 3/4 .090
The cars can be TIG or MIG welded and each chassis must get inspected by NASCAR before it gets a ser# and is allowed to race. Most of the suspension parts are TIG welded. IE: upper and lower control arms, shock mounts, spindles etc.

Crome moly?

Originally Posted by ASKANDY

Rich,
Good question.
The chassis are mild steel tubing. The sq frames are .120 wall and the other tubes vary from .065 up to .090 1 3/4 tubing depending on where the tube is located and how critical the tube is. Most of the main safety tube is 1 3/4 .090
Check out some of my pics from Daytona.

The rules require the cars to be about 3500lbs. So there would be no real advantage to using 4130

Be a shame to waste all the good material in banked oval demo derby anyway

Seriously though, what is the life expectancy of one of those chassis, 1 race, maybe 2?? Maybe thats why racers get away with sins in welding process that would never last in other avenues. I have co-workers that have come from GM and Ford's engineering group, and they all aggree that the performance end of those companys can teach a lot about performance, but little about lifespan.